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60 lines
2.4 KiB
C++
60 lines
2.4 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
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// written by Christian Daniel //
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// Copyright (C) 2015-2019 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// Copyright (C) 2021-2023 Jon Beniston, M7RCE <jon@beniston.com> //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QFontMetrics>
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#include <QPainter>
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#include <QDebug>
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#include <cmath>
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#include "logslider.h"
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LogSlider::LogSlider(QWidget *parent) :
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QSlider(Qt::Horizontal, parent)
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{
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setRange(0, 1000);
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connect(this, &QSlider::valueChanged, this, &LogSlider::handleValueChanged);
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setPageStep(1);
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setTickPosition(QSlider::TicksAbove);
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setTickInterval(m_stepsPerPower);
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}
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void LogSlider::setRange(double min, double max)
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{
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m_start = floor(log10(min));
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m_stop = ceil(log10(max));
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m_steps = m_stop - m_start;
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setMinimum(0);
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setMaximum(m_steps * m_stepsPerPower);
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}
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void LogSlider::handleValueChanged(int value)
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{
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double v = pow(10.0, value/(double)m_stepsPerPower + m_start);
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emit logValueChanged(v);
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}
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void LogSlider::setValue(double value)
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{
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int v = (int)((log10(value) - m_start) * 100);
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QSlider::setValue(v);
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}
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